#include <stdio.h>

class Base
{
public:
  Base() {}
  ~Base() {}

  virtual void run() = 0;
};
class Child : public Base
{
public:
  Child() {}
  ~Child() {}
  void run() { printf("Child::run()\n"); }
};

int main ()
{
   Base *c = new Child();
   c->run();
   delete c;

  return 0;
}

Child::run()